Box motion for looms



Jime 15 1926.

c. A. DIGGINS BOX IOTION FOR LOUIS Filed July 25, 1924 Patented June 15,19 26 UNITED STATES PATENT OFFICE.

CHARLES A. mu ing, on woken-Sana, MASSACHUSETTS. ASSIGNOR 'ro onomr'ron'& KNOWLES Loom worms, or WORCESTER, MASSACHUSETTS, A CORPORATION ormssxcntrsam.

Box ii'o'rron FOR LOOMS.

xp acaets filed July 25,

This invention relates to improvements in box motions for looms and anobject of the invention is to provide an improved box motion operated bythe pattern mechanism,

such as a dobby, of a loom.

In Patent No. 774,488 there is shown a box motion operated by a flexibleconnector which extends from a dobby jack. yielding connect-ion, whichprevents positive actuation of the boxes, is located between theflexible connector and the box rod so that the box may be positioned forpicking before the shed is entirely open. Also, the flexible connectionas shown in said patent changes the limits of motion of the box rod whensaid flexible connection is moved from one notch to another in the dobbyjack.

The principal object of my present invention is to overcome theaforesaid disadvantages by providing a cam of fixed throw which shall beeffective to move the box rod positively the proper distanceirrespective of the throw of the dobby jack. Also, a more particularobject of my invention is to compensate for any changes which may affectthe limits of motion of the box rod when the flexible connection isadjusted with respect to the dobby jack. I

l Vith these and other objects inview which will appear as thedescription proceeds, my invention resides in the combination andarrangement of parts hereinafter described and set forth in the claims.

F In the accompanying drawing, wherein one form of my invention isshown,

Fig. 1 is a side elevation of a loom having my invention appliedthereto,

Fig. 2 is a rear elevation of the structure shown in Fig. 1 looking inthe direction of arrow 2, Fig. 1,

Fig. 3 is a fragmentary top plan of the connector levers, and

Fig. 4' is a fragmentary elevation of the cam lever shown in position toraise the boxes.

In the drawings I have showna loom 10 1924. Serial No. 728,268.

mounted a roll 18. In order to impart motion tothe boxes on the oppositeside of the loom I have provided a shaft 19 the remote end of which isconnected by means of lever 20 to the box rod (not shown) opposite theone shown in Fig. 1 and the near end of shaft 19 has secured thereto ashort arm 21 which is connected by means of link 22 to lever 23.. Lever23is pivoted on stud 16 and has the rearward extension thereof providedwith a roll 24. \Vhen the levers 15 and 23 are moved the boxes will beraised or lowered accordingly.

In order to actuate the box levers I provide a dobby mechanism Qihavinga series of dobby levers one of which is indicated at 26 and is providedwith upper, and lower hooks 27 and 28, respectively. Two dobby acks 29are pivoted as at 30 to the dobby frame and have their. intermediateportions pivoted to correspondinglevers 26 as at 31. The upper end ofeach lever or jack 29 is provided with a. series of notches 32. lViththe except-ion of rolls 18 and 24 the mechanism thus far described is ofthe usual construction.

My invention relates more particularly to the connections between thedobby harness levers 29 and the box levers and in carrying out myinvention I provide a stand 4-0 secured to the arch of the loom andhaving journaled for loose motion therein a pair of shafts 41 and 42.Shaft 11 has secured. thereto by means of set screws upper and lowerarms 43 and 4.4, respectively, which are independently adjustable withrespect to each otherand in like manner shaft 42 has secured theretoupper and lower arms 4:5'and 4.6, respectively. It is to be under stoodwhere boxes are to be used on each end of the loom asshown herein twodobby harness levers will be employed, each of which willbe connected tothe upper arms as shown in Fig. 2, connector 47 being attached to armand connector 48 being attached to arm 43.

Secured to the arches is a second stand 49 having loosely journaledthereon roll 50 over which pass chains 51 and 52 which are connectedrespectively to the depending arms 46 and 44'. After passing over theroll 50 the chains are attached to rigid'connectors 53 and 54,respectively, which are pivotally connected at their lower ends to camlevers 55 and 56, respectively, each of said levers being provided witha notch and a dwell portion 58 preferably concentric with stud 59 onwhich said cam levers are pivoted. The surface 60 between the dwell 58and the notch 5'? is the rising portion of the cam by means of which therolls on the box levers are depressed.

In the operation of my invention with the parts in tire position shownin Fig. 2 the levers 55 and 56 will be positioned with their rolls inthe dctents of the cam levers and the boxes will be down. When thepattern mechanism calls one of the (lobby harness levers 29 thecorresponding shaft and arms will be swung ina right hand direction tolift the operatively associated cam lever against action of its spring61, the result of which is to cause the corresponding roll to bedepressed to lift the forward end of the attached lever. In Fig. 4: lhave shown the lever 55 raised and the roll 18 depressed.

The shed forming mechanism and the picking motion of a loom are usuallyso timed that the picking starts before the harness frames have reached.the extreme limit of their movement and this fact makes it necessary tohave the box from which the shuttle is to be picked in alignment withthe lay before the dobby harness lever has completed its movement. Bymeans of the cam levers shown herein 1 am able to raise the boxes inproper time with the rolls and rest on the dwell portions of the saidcam lever for such time as. the harness continues to move after theboxes are in position. Also, the shedding mechanism is usually sodesigned that it starts and stops with a slow motion and attains agreater motion when the harnesses reach half their throw so that if theboxes were connected to the harness jacks they would be stopped whilesaid jacks were moving at a relatively fast rate of speed. By means ofthe cams however, I am able to raise and lower the boxes by a motionindependent of and different in charactor from the motion of the harnessframes. In order to position the notches 57 with respect to their rollsand to vary the angular motion of the cam levers the connectors l7 and48 may be moved from on-eof the notches 32 to another of said notchesbut as these notches are not usually concentric with the pivots of theconnectors it will be seen that the position of the lower arms A and a6will be changed for each adjustment of their connectors with respect tothe dobby lever. As shown in Fig. 2, for instance, if connector -l7 wereto be raised to the upper notch, shaft 42 would receive a slight lefthand rotation, the result of which would be to move notch 57 away fromLeas es the corresponding roll because of the action of the associatedspring 61. In order to take up this extra motion the arm 4.6 would beloosened on its shaft and given a new setting to restore notch 57 to itsproper po sition.

From the foregoing it will be seen that l have provided a box motionoperated from the pattern mechanism in such a Way as to be independentof a portion of the motion of the harness levers and that any slightdiscrepancies which might result from adjustments at the harness leverscan be compensated for by the arms.

Having thus described my invention it will be seen that changes andmodifications may be made therein by those skilled in the art withoutdeparting from the spirit and scope of the invention and 1 do not wishto be limited to the details herein disclosed, but what I claim is: V

1. In a loom, shuttle boxes, a box lever to raise and lower the boxes, aroll there on, an angularly movable member having a cam surface, a notchand a dwell, a harness lever, connections between the harness lever andthe member, the roll normally being positioned in the notch, said memberbeing movable throughout the whole motion of the harness lever and saidroll being engaged by the cam surface during a portion of the movementof the member and engaging the dwell for the remainder of the motionthereof, and means to return the memher as the harness lever moves inthe opposite direction to bring the notch into operative relationshipwith the roll.

2. In a loom, shuttle boxes, a box lever to raise and lower said boxes,an angularly movable cam operatively positioned with respect thereto, aharness lever, connections between the harness lever and the cam, meansto adjust the harness lever and a portion of the connections withrespect to each other to vary the amount of motion of said portion, andmeans to vary the setting of another portion of the connectionsindependently of the point of attachment between said connections andthe harness lever to adjust the angular setting of the cam.

3. In a loom, shuttle boxes, a box lever to raise and lower the same, acam operatively positioned with respect thereto, a harness lever, andconnections between the her ness lever and the cam, said connectionsbeing in two parts, each part being independently adjust-able withrespect to the other part, one of said parts being adjustably connectedto the harness lever to vary the amount of motion of said part and theother part being connected to the cam to adjust the angular settingthereof.

4. In a loom, shuttle boxes, a box lever to raise and lower the same, acam having a notch formed therein, a roll on the box lever to bereceived by the notch, a harness lever, connections between the cam andthe harness lever, said connections being in two parts one partadjustably connected to the harness lever to vary the amount of motionof said part and the other part connect-ed to the cam, and an adjustableconnection between the parts to vary the angular p0sltion of the cam.

5. In a loom, shuttle boxes, a box lever to raise and lower said boxes,a roll thereon, a cam having a notch positioned to receive the roll, aharness lever, and connections between the harness lever and the cam,said connections including a part adjustable with respect to the harnesslever to vary the amount of motion of said part and a second partoperatively connected to the cam lever and adjustable with respect tosaid first named part to vary the angular position of the earn.

6. In a loom, shuttle boxes, a box lever to raise and lower said boxes,a roll thereon, a cam for said lever having a notch to receive saidroll, a harness lever, and connections between said harness lever andthe cam, said connections including a shaft, a pair of arms adjustablymounted on said shaft, linkage between one of said arms and the cam tovary the angular position of the cam when the arm attached thereto isadjusted and linkage between the other arm and said harness lever andhaving an adjustable connection with respect to said harness lever toadjust the amount of motion of said other part.

In testimony whereof I have hereunto affixed my signature.

CHARLES A. DIGGINS.

